RPM Pinion Case - Black - 80412RPM Pinion Protector Case RPM designed this enclosed pinion case to hold each pinion on its own post. There is no need to tighten the setscrew to hold the pinions in place. Included is a peel off decal sheet with two pinion to spur gear ratio charts for both 48 and 64 pitch gears. The appropriate chart can be placed in the recessed area on the bottom of the case. Also on the decal sheet is a set of numbered squares from 14 to 31 (gear teeth), which